Foolish? Your opinions are yours. Facts are otherwise. You are simply, wrong. You can’t put humpty dumpty back together again. Wartime promotions in a large mostly poorly run union army commanded by multiple perfumed prince crippled failures— these do not make a warrior no matter how some writer apologist tries to rewrite it (not to mention the basket case who was president who admirably and desperately was trying to satisfy his oligarch railroad masters and stockjobbers who had reached their limits of capital expansion, short of the war he delivered to them). “Mister, here’s your mule”! It must have been the “celibacy of the saddle” that drove Custer to wear velvet— yep, rock star.
There are numerous Union military leaders who stand out as superior: Winfield Scott Hancock,John Buford,Joshua Chamberlain,David Farragut- to name a few. Many more notable exceptions- Sickles, Custer,McClellan, Hooker,Schurz,and the psychopath Turchaninov come to mind.
Not one to wax romantic about the old South, and holding no hatred for any but the northern lying oligarchs, the practical fact is that the war should not have happened- but was driven to happen, as they always have— by power brokers and the moneyed interests, and in this case the West expansion, Mexican/European intrigue and greed.
They placed the human dregs of the post WBTS union army on the frontier for indian eradication, people who were disengaged- immigrants, psycho glory seekers and profiteers. A sad chapter. Custer had it coming and the Lord, and Custer’s equally despicable command saw fit.
They DON’T teach Custer (except as what NOT to do) at ANY military academy of repute. Not Sandhurst, West Point, USNA, USAFA... not even École spéciale militaire de Saint-Cyr. They do teach Lee, Longstreet, some Grant (some). They teach Cetshwayo kaMpande,and... Stonewall Jackson,Douglas MacArthur and George Patton.
I have no idea what they teach at military colleges today - probably gender neutrality and what to do when stuck in a foxhole with a horny transgender woman (or is it man?) But if you want to study a strong, determined manly soldier from a family of brave warriors, you could do worse than Custer. Or Grant, for that matter.